I have a 355 small-block Chevy in my 1971 Nova and just swapped on a set of used aluminum heads. I was told the heads have 180cc intake runners, 64cc chambers, 65cc exhaust ports, and 2.02/1.60-inch ...
Answer: In general, an engine's timing chain isn't considered a maintenance item. But in high-mileage situations, a chain may indeed stretch and cause problems. I don't know of any GM dealerships ...
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